package org.zjzWx.util;

/**
 * @projectName：HivisionIDPhotos-wechat-service
 * @package：org.zjzWx.util
 * @className：BASE64DecodedMultipartFile
 * @author：热伊木
 * @email：uyevan@163.com
 * @description：BASE64DecodedMultipartFile
 * @date：2024-09-17 22:28
 * @version：1.0
 */

import org.springframework.web.multipart.MultipartFile;

import java.io.*;
import java.util.Base64;
import java.util.Base64.Decoder;

/**
 * base64转MultipartFile
 */
public class BASE64DecodedMultipartFile implements MultipartFile {

    private final byte[] imgContent;
    private final String header;

    public BASE64DecodedMultipartFile(byte[] imgContent, String header) {
        this.imgContent = imgContent;
        this.header = header.split(";")[0];
    }

    @Override
    public String getName() {
        return System.currentTimeMillis() + Math.random() + "." + header.split("/")[1];
    }

    @Override
    public String getOriginalFilename() {
        return System.currentTimeMillis() + (int) Math.random() * 10000 + "." + header.split("/")[1];
    }

    @Override
    public String getContentType() {
        return header.split(":")[1];
    }

    @Override
    public boolean isEmpty() {
        return imgContent == null || imgContent.length == 0;
    }

    @Override
    public long getSize() {
        return imgContent.length;
    }

    @Override
    public byte[] getBytes() throws IOException {
        return imgContent;
    }

    @Override
    public InputStream getInputStream() throws IOException {
        return new ByteArrayInputStream(imgContent);
    }

    @Override
    public void transferTo(File dest) throws IOException, IllegalStateException {
        FileOutputStream fileOutputStream = new FileOutputStream(dest);
        fileOutputStream.write(imgContent);
        fileOutputStream.close();
    }

    public static MultipartFile base64ToMultipart(String base64) {
        String[] baseStrs = base64.split(",");

        byte[] b = new byte[0];

            /*BASE64Decoder decoder = new BASE64Decoder();
            b = decoder.decodeBuffer(baseStrs[1]);*/

        Decoder decoder = Base64.getDecoder();
        b = decoder.decode(baseStrs[0]);


        for (int i = 0; i < b.length; ++i) {
            if (b[i] < 0) {
                b[i] += (byte) 256;
            }
        }
        return new BASE64DecodedMultipartFile(b, "data:image/png;");
    }

}
